5 Umarex Hk Mp5a5 of 2026 For Drop-In Battery Fit

1

Mighty Max Battery 8.4V 1600mAh Butterfly Replaces Umarex HK MP5A5

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  7.4
• Brand
  Mighty Max Battery

Key specs2

Replica Compatibility

Umarex HK MP5A5 3-Round Burst AEG

Battery Form Factor

The twin-stick butterfly arrangement separates cells into two slender banks, ensuring the pack fits alongside the inner barrel assembly in compact front ends.

Pros & cons32

Pros

• Matches the specific power demands and electronics of the Umarex HK MP5A5 3-round burst AEG
• Split butterfly layout allows insertion into compact MP5 forend compartments without pinching wiring
• 8.4V 1600mAh capacity provides sustained power output for extended shooting sessions

Cons

• Charger is not included, requiring an existing compatible charging unit
• Specific configuration is tailored for the 3-round burst model rather than standard or EBB variants

2

Mighty Max Battery 8.4V 1600mAh Butterfly Replaces Umarex HK MP5A5

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.5
• Brand
  Mighty Max Battery

Key specs2

Package Contents

• 8.4V 1600mAh butterfly battery pack
• Dedicated 8V wall charger

Recommended Application

Ideal for standard Umarex HK MP5A5 owners needing both a replacement power pack and a dedicated charger to replace lost or dead gear.

Pros & cons32

Pros

• Includes an 8V wall charger alongside the 8.4V 1600mAh battery pack for an immediate all-in-one setup
• Designed specifically to replace power packs in standard Umarex HK MP5A5 AEG models
• Butterfly cell split fits narrow airsoft handguards without forcing receiver pins or wiring harnesses

Cons

• Bundled 8V charger lacks stated smart shut-off features, so charging time must be monitored manually
• Standalone replacement buyers who already own a charger pay for redundant charging hardware

3

Mighty Max Battery 8.4V 1600mAh Butterfly for UMAREX GG HK

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  7.5
• Brand
  Mighty Max Battery

Key specs2

Package Contents

• 8.4V 1600mAh butterfly battery pack
• 8V wall charger unit

Target Replica Model

UMAREX GG HK MP5 SD5 Covert

Pros & cons32

Pros

• Bundled with an 8V charger so you do not need to source charging hardware separately
• Dedicated replacement configuration built for the UMAREX GG HK MP5 SD5 Covert model
• Butterfly cell profile fits inside the integrated suppressor handguard housing

Cons

• Buyers with existing chargers must verify whether purchasing the bundle is necessary
• Model compatibility targets the SD5 Covert variant rather than standard MP5A5 platforms

4

Mighty Max Battery 8.4V 1600mAh NiMH Butterfly Replaces UMAREX GG

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  9.2
• Brand
  Mighty Max Battery

Key specs2

Target Replica Model

UMAREX GG HK MP5 SD5 Covert AEG

Cell Chemistry

NiMH construction provides stable power delivery for standard gearbox cycles without the balancing requirements of lithium chemistries.

Pros & cons32

Pros

• Nickel-metal hydride (NiMH) chemistry avoids lithium storage restrictions and simplifies charging
• Butterfly configuration splits the pack to fit the distinct forend of the UMAREX GG HK MP5 SD5 Covert AEG
• 8.4V rating and 1600mAh capacity deliver reliable cycling without excessive gearbox wear

Cons

• Standalone pack ships without a charger, requiring a separate NiMH-compatible charging unit
• Specifically designated for SD5 Covert receivers and not verified for standard MP5A5 forends

5

Mighty Max Battery 8.4V 1600mAh NiMH Butterfly Replaces Umarex GG

View on Amazon

• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  7.8
• Brand
  Mighty Max Battery

Key specs2

Replica Compatibility

Umarex GG HK MP5 A5 EBB AEG SMG

Cell Chemistry

The 8.4V NiMH setup provides stable voltage to run both the mechanical gearbox and the electric blowback mock bolt assembly reliably.

Pros & cons32

Pros

• Built to meet the cycling and motor load requirements of the Umarex GG HK MP5 A5 EBB (electric blowback) SMG
• NiMH butterfly cell design slides cleanly into the replica receiver without obstructing blowback linkage
• 8.4V 1600mAh rating delivers dependable power output across continuous semi and full-auto fire

Cons

• Does not include a charger, so you must supply a dedicated NiMH power adapter
• Buyers running non-blowback or burst-variant MP5s must verify mechanical clearance and plug fit

Last update on 2026-10-08 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Will an 8.4V 1600mAh butterfly battery fit into an Umarex HK MP5A5 handguard?

Yes, an 8.4V 1600mAh NiMH butterfly pack is designed specifically to match the narrow battery space inside the Umarex HK MP5A5 AEG handguard. The dual-stick configuration divides the cells into two slender halves that slip directly along each side of the barrel assembly. Unlike the bulkier power plants used on a CO2 BB gun, this electric air rifle relies on a clean split layout to close the front forend without binding wires or jamming the cocking tube.

Should you buy a standalone replacement battery or a bundle with an 8V charger?

Choose the standalone 8.4V 1600mAh butterfly battery if you already have a functional, compatible charging unit with matching connectors. If your original charger is misplaced, damaged, or unable to hold a stable charge, choose a bundle that includes an 8V charger. Pairing an 8.4V NiMH pack with an 8V charger built for that specific chemistry prevents overcharging and ensures your MP5 receiver receives consistent power every time you head out to shoot.

Does this battery support 3-round burst and electric blowback MP5 variants?

Yes, dedicated 8.4V 1600mAh butterfly packs directly replace the original cells on both the Umarex HK MP5A5 3-Round Burst AEG and the Umarex GG HK MP5 A5 EBB AEG SMG. The 8.4V discharge delivers the necessary current to power the internal motor, cycling the trigger switch assembly and driving the mechanical blowback action smoothly. For shooters practicing rapid drills alongside a tactical air rifle, maintaining dependable voltage delivery keeps burst intervals crisp and predictable.

Will this 8.4V pack work in the UMAREX GG HK MP5 SD5 Covert AEG?

Yes, the 8.4V 1600mAh NiMH butterfly battery is an exact replacement for the UMAREX GG HK MP5 SD5 Covert AEG. It is available as a single replacement pack or paired with an 8V charger depending on your setup needs. Because the SD5 Covert utilizes an integrated mock suppressor front section, using a flexible butterfly layout is critical to seat the cells flat without forcing the outer casing.

What should you verify to prevent wire damage when installing the pack?

Check that each half of the butterfly cell bank slides completely forward into the handguard side recesses before you reconnect the wiring leads. Tuck the connector plug and excess wire into the open cavity beneath the barrel assembly rather than squeezing them directly against the locking pin hole. If the forend resists sliding shut, pull the battery out and check lead orientation instead of forcing the front pin into place.

How do you confirm your Umarex MP5 battery needs replacement?

A battery that requires replacement will cause sluggish semi-automatic cycles, weak motor response, or complete failure to cycle the gearbox after a full charge cycle. If your 8V charger indicates a completed charge but your replica stalls mid-stroke or drops fire rate rapidly, the internal cells have likely degraded. Installing a fresh 8.4V 1600mAh NiMH replacement restores fast trigger response and consistent mechanical operation immediately.